It all depends on the goodwill of the issuer. If you continue collecting the correct data for the next country(ies) you're visiting, and complete the final section when returning to your own country, you should have no problem getting your deposit back. The worst that can happen, in my opinion, is that the issuer will hold back the deposit for one year in anticipation of any claim to come in. But I think this is highly unlikely. So watch your documentation, forge if necessary, but not neccessarily.