What you guys are looking for is a weathered paragliding buckle.
The problem is that we do not just want any quick connect buckle. We want the exact make/model/year of production used in the movie. So far, I have searched for quick release buckles, quick connect buckles, sling bag buckles, messenger bag buckles, belt buckles, side release buckles, climbing buckles, rappelling buckles, parachute buckles, paragliding buckles, harness buckles, tower harness buckles (
12 different brands of them), racing buckles, Stubai buckles, Cobra buckles, Raptor buckles, skysport buckles, diving buckles, extreme sport buckles, hiking buckles, dog collar buckles, large collar buckles, emergency release buckles, and several more I can't remember right now. So far, not a single one has had the lip below the latches I show in the picture in the 2nd post...
So unless someone has connections to someone who worked on the show and can ask the prop or costume maker (I'm not sure which category bags fall under), we're unlikely to find the match...