Lost: Lost - Man's gold chain and cross

Hi, my husband and myself (both pensioners), went to Huercal Overa hospital on Wednesday for a 5 o'clock appointment at the dermatology department, using the front entrance of the hospital initially, after having parked in the large car park opposite.

We left the hospital about 6.15 p.m. and had a drink at the cafe at the front end of the car park. 

Yesterday morning, my husband realised he was missing his gold chain and cross (that I bought him over 35 years ago) and can only conclude that the clasp came undone. We think it is likely to be somewhere within the hospital or cafe that he lost it and are prepared to offer a small reward for it's safe return as he is very upset by its loss, so any assistance in this matter would be greatly appreciated. Thank you for your help.