There's no way to recover a transfer that is no longer available on our servers. If you see this exclamation mark, it's too late:
It means that when the transfer hits the expiry date, it gets deleted from our servers. Deleted, foetsjie, gone with the wind. Gone really means scrubbed completely from our servers.
We promise senders a certain period of availability when they use our service, and we need to keep our promise and delete the transfers after that period. Besides keeping a promise, we also need the server room, for new uploads.
You were probably hoping we have a hidden stash of expired files somewhere to retrieve those valuable files. We wish. But we don't.
The only option -if you're the recipient of these files- is to contact the sender and ask them to send you the transfer again.
If you would like some more info on the expiry dates of your transfers, have a look here: How long are my uploads available to download?