To sell them.
OP I'd recommend the members market on here if you have access.
Apple will let you trade them in against a new iPad. Given that they do not hold charge they'll give you a far better price than elsewhere.
Quite possibly, if it's like the couple of times I've sent something to them as part of a trade-in, I've had to take it to the Post Office and get it scanned in. It normally arrives within two days but remember that the postal system has high delays at the moment.
sweet! how much you get for it, old apple devices are naff once apple drops support. You can't do much with them which is annoying.
If you wanted to turn that into cash just sell the gift card for a little less.
Phew, so it was just the slow post. Next time, I'd take it to the Post Office to get proof of postage though.