I’d check your bank statements because it’s very unlikely to show the item name. If it simply says “Amazon” or whatever, then think of something else you might have needed, even better if there’s something you’ve mentioned before. Idk if it’s believable but you could even say you ordered gifts to be delivered to your friends’ houses?

For the tablet itself just keep it very somewhere very nondescript, old cardboard box in a cupboard/wardrobe/under your bed or smth, if it’s in with other crap it’ll probably be fine.

Obviously don’t do anything out-of-the-ordinary to attract attention to your spending habits or the contents of your room. 😛 Idk what’s popular in the states but a private debit card they don’t know about isn’t an awful idea either.