I would think all TV's would have their own remotes along with any "entertainment" style radios. Our Georgetown has three Vizio TV's each with their own remotes and the dash mounted radio/DVD player and the outside mounted radio/DVD player each have their own remotes. I expect someone appropriated one or more of your remotes.
John & Gloria Hunsaker FROG Member CA-0030-988
2014 Georgetown XL 334QS (class A with 4 slides)
2013 Smart Car TOAD
Blue Ox Aventa LX tow bar, base plates, diode kit
SMI Stay-IN-Play Duo auxiliary braking system
25' Off shore blue water fishing boat