Perhaps but one would think that having luggage in a checked out room would be a somewhat big deal in a mid-sized hotel like this. Also, that moving luggage would require security's involvement so they would know and OP wouldn't have had the disconnect issue with his luggage.

And on the give the LP guy a break for his comment (but not for not having any info on the missing luggage), I note that there are some hotel room luggage thefts in the news in SLC today. So, perhaps the LP had information being shared from other hotels about this issue.