Sorry to stick to this topic when the OP may be considering a variety of resorts, but here is some additional historic information. When we first started discussing the abundance of thefts at the Riu resorts, it was theorized that there is a 'ring' or 'gang' or 'group' of thieves who look out for each other while one or two 'bad guys' are stealing stuff. Someone on the forum also commented that it is difficult to fire employees. Note that I am just sharing a summary of that discussion.
So if the safe isn’t safe, what are you supposed to do? Putting a lock on luggage makes no sense as they can just take the luggage.