yeah bank deposit is probably the way to go
you know for damn sure paypal isn't going to take kindly to random deposits of 10k+ unless you're a millionaire. I sold 5k worth of items in a few days span and then had someone gift me $200 and I got those funds frozen for a millennium.
its not worth that risk to get on their blacklist...
be ready to hit up your grandmother for her full identity and bank accounts to setup ebay and pp under