In my last 5th wheel that had removable " transit locks " they were aluminum tubes, with rubber end caps. You jammed them into place to hold the slide room , in case the drive gears failed while driving. So , if you can't see anything at the top of the slide , chances are you didn't get them when you bought the RV.
Current coach has hinged bars 2/3rds the way up at either end of the slide that you push up and , over centre the hinge slides, there is no missing them , so your RV has or had something different.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.