I want to know if more people have the same experience or maybe I missed something.

End of January I shipped a pony package with track & trace to Brazil. Buyer was fully aware that it could take some time to arrive. And also got the track & trace from me to follow the package. Post office also agreed I filled in address and customs form correctly. So the waiting game and follow the package could begin.
Beginning of February the t&t was "item is at customs" in Brazil. Ok, let them check whatever they want to check.
Yesterday I saw at the t&t site that package could not be delivered and is being returned to me. So now I have to wait until it comes back to me. And we really don't have a clue why. Buyer doesn't want the money back, even offered shipping again.Well let's then wait until the box arrives and then decide how to solve this.
Ponies,1 plush, squishy pops and loose blind bag ponies are all G4 with the only sort of special the Guardians of Harmony Spitfire & Soarin with that flying thing and Diamond Mint with liquid in it. Everything else just common, low value. Stickers and cards as extra's. Luckily I made pictures of the box and addres/custom label.

Today I saw the Medley plush on the dutch Amazon in the Basic Fun shop. But no pre-order or indication when available.

That looks funny

Currency were Dutch Guilders, it was 100-200 The most expensive mlp set.

World’s longest running My Little Pony Convention!

https://www.ukponycon.co.uk/

Hope to see you there.

I live in Amsterdam so that's my to go place at Kings Day But I can't cover all markets in the city, so I usually pick out the ones with the biggest chance to get ponies. Most of them are private sellers. Some areas in cities are for children only.

Updated my site. Shipping is from The Netherlands

https://barnaclestreasures.wordpress.com/

Do you have a location or a specific collectors item that person might be known for?
The details you are mentioning are very common for someone with a large collection.