In fact, I explicitly told the staff member that I was leaving the airport for around 4 hours and checked that someone would still be available on my return. She confirmed - with the downtrodden look of someone working late on Christmas Eve but with a professional smile - that she'd be there until Flounge closed at 10pm. As to risk, items that reach that storage area have been through security at least once (on entry to airside) and in this case, twice (at BHD and again on transfer at LHR). Any item not claimed from that storage area when Flounge closes is taken to Airport Lost Property (a process that takes around 24 hours), from which it can then be reclaimed in the usual way i.e. ID plus handling fee (for around 2 months afterwards). By the way, I found a small piece of IT kit down the side of my chair in the Flounge. I was in the terrace area in one of the new large black semi-enclosed chairs. If it's yours (to any reader of this posting), I turned it in so it should reach Lost Property in around 24 hours.