G3 McDonald's ponies having numbers and letters written on their hooves?

[TheBeatlesPkmnFan42]

Here's the image of my Daisy Jo with "TBA" on hers:

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Out of the other 2005 McD toys, Serendipity has "3BC". My others from this year do not.

As for my 2008 ones, Rainbow Dash has "XAA", StarSong has "C92", Scootaloo has "A85" (maybe? it's a little faded), Cheerilee has "B87", Pinkie Pie has "R88", Minty has "L8U". Out of these 2008 ones only Sweetie Belle and Toola-Roola have nothing.

Does anyone know why these appear on some of their hooves? What do they mean? I find it odd that it only appears on some and not others, and that it seems to be more common on the 2008 ones than the 2005 ones.