Lost car keys at Heathrow airport?

We've just come back off holiday, were at the beginning, my boyfriend realised he had lost our car keys somewhere in Heathrow airport. Our friend managed to get in touch with them whilst we were on holiday and they said they had been handed in and we were given a reference number and told we could collect them when we got back.The day before we flew we looked at their opening times and they shut before we flew back in. We rang them up to see if there was anyway we could get our keys back when we flew in and they said that they would leave them in their excess baggage branch for us.However when we got there we looked through the tray of keys (which they let us look through unsupervised which was worrying!) they were not there.This branch had no records of any reference numbers (they're not given them apparently) and the guy basically said your on your own.Where do we stand with this if they have lost our keys taking them to this other branch?Any help would be great, it wasn't too bad for us as I had remembered to back the spare keys, but I'd hate to thing what would happen if that was someone's only set!!Thanks!!|||There was no guarantee that the keys they had found were actually yours. Contact the original lost property area when they are open and go and have a look in case the person who was actually supposed to take the keys over got distracted and forgot.|||Heathrow Airport didn't lose your keys - your boyfriend did! Would you be looking to chase him for any compensation?There's no guarantee that the keys that were handed in were yours, which would explain why they weren't there.I think you'll just have to chalk this one up to experience, and suck it up.