My suspicion is that the package was picked up in a scan, and sent for analysis to check for possible money laundering. Sending a loaded wallet is obviously a way to transfer funds with them being recorded on the blockchain.
I don't think it's very likely anyone would send a physical device to transfer funds that way. A blockchain transaction doesn't reveal if the transaction was to another wallet of your own, or to someone on another continent.
By sending a wallet without making a transaction, the receiver knows the sender can still access the coins, and even if that's the plan, sending the mnemonic seed split into several parts via different encrypted channels is much easier than sending the actual device. I've used something similar to receive mnemonic seeds for my Fork claiming service.
I would consider the device compromised now. Don't trust it anymore.
see if somebody here will sell a small amount of crypto to load on it.
I would if I could receive pounds anonymously, but I can't.