Let me preface this by saying that I'm new to table top roleplaying games in general, so forgive me for my rookie mistakes.
I'm GM for my group and there is one player that seems obsessed with collecting everything that's not nailed down. Games get extended unduly because he insists on checking every locker, every box, every body, and picking up everything that he can carry, and then tries to debate how expensive or how useful the stuff is. There's actually a running joke about the line "you find nothing of value". While it's great for a laugh at first, most of the people in the group have gotten pretty tired of it, since it's not really a loot-drop based game, but I don't really know how to go about fixing the issue without making someone mad.
I ain't too concerned about hurt feelings, but I also don't want to start a fight if I don't have to, so what do you experienced GM's do to keep a leash on these kinds of players? Is there something I can do to alleviate the problem?
Big thanks from a mega noob!