There have been the 2 MOC ponies badly packaged that came off their card in transit :/ One was Movie Star Wind Whistler. Obv. I still have all the pieces and in that case the seller partially refunded me the difference but I've never replaced her :/

There was also the person in the pony community who lied about sending a package, claiming it got lost in the post. They later sent a 'replacement' lot of custom hair which turned out to include some of the lamer items from the 'missing' original lot.

When I tried to complain about it she threatened to have her (then stationed in the UK) boyfriend come and 'sort me out'. And she and a friend of hers started some rumours about me on the trading post claiming I used my mother's health situation to 'get sympathy and trades' and a bunch of other things that were not true. I was only 18 at the time and it freaked me out big time.

Fortunately both these unpleasant individuals are now gone from the community, but at the time they were tolerated because a: they had a cult of fear and b: people wanted the girl's customs and so turned a blind eye to her other antics.  In hindsight, given the wider context, I'm pretty sure it was a targeted attack since the 'friend' had been trying to get me to remove Italian ponies from my website for months before this so she could have the only Italian ID site. Sounds so stupid now in the days of multiple sites, gallery, wiki and whatever. But at the time it was scary.

On a more neutral note, there was a lot of MOC items packaged in a box of soft toys loose as packaging. But they arrived in ok shape, and the ones I wanted were thankfully not damaged.

That’s awful Taffeta! I am glad that it ended all okay.

Welcome to the arena Catsinger! My opinion may be slightly biased.... but G-3’s are the best! What is you favorite thing about G-3? 
Oh and Congrats on graduating!

If this makes you feel better, I have had packages that had not had tracking updates for weeks but then suddenly get tracking updates and/or arrive after I have submitted a where is my package request. Sometimes it helps packages get moving..I am so sorry that happened to you! I am crossing my fingers that your package makes it to it’s destination!

As an eBay seller myself, I would contact the seller first prior to leaving negative or neutral feedback. I recently had a buyer leave neutral feedback due to my calculated shipping cost(this is exactly what you pay at the post office).....but I cannot control what USPS asks so that was really  frustrating...
I am not sure if the specifics, but you could
message the seller with a picture of the dirty ponies if you took some  and then ask for a possible return or partial/full refund.
As of shipping, eBay gives the option for sellers (in their listing draft) to  have a policy of shipping within 12hrs to a few days after order to process and package it. But six days seems kinda long (most sellers do it w/I 24hrs)....maybe they were trying to limit their post office visits to once a week?
If it was me, I would not leave any feedback and just not buy from them again. 

Just updated accessories and the g-1 page! I have added all of my collector pose ponies.

I have not been i the market for her but on eBay you will probably pay around $45-60 USD.

This is according to what I have seen on eBay...
Backstroke sticker $5-10 Used w/o backing & $10-20 with backing.
Back in April, a splasher sold for around $46 USD with all accessories so my guess would be around $10-20 USD for her sticker.
I am not sure if this has changed since it is basically summer now and more people might be in the market.  I am not sure about Sea Shimmer. Hope this helps!