I'd personally contact TakTOM for replacement stickers, but if BBTS is based outside Japan, then I think that voids any potential replacement warranty for stuff like that. Cos I know when I was getting a replacement part for my MP01 Convoy, they explicitly asked me if I had purchased my toy from a store in or outside of Japan. Luckily for me I'd purchased it from a Japan-based dealer, so Takara were happy to cover it at their expense.
Otherwise, the next option I'd consider would be to hit the seller up for a replacement. My wife sometimes does online shopping for clothes and books, and there have been a few times when there's been a problem and the seller asks her to send the defective items back to them, and they send a replacement and also reimburse her for the cost of sending the item back (she had to obtain a receipt from Au Post and scan/email it to them).
Maybe you could tell BBTS about this and see if they offer you a discount voucher or something off your next purchase. Squeaky wheel gets the oil, dude.
Anyway... your toy, your call.
How does the toy look without those stickers? Are they really _that_ essential? <shrugs>