Maybe you have one of the unique mounting systems on the camper.
Does the bottom of front camper wall have plate extending forward? I have seen a slightly raised front mounting plate that bolts through the truck bed which then tucks the camper plate under it. The only tie downs were in the back and were angled to pull the camper forward into that "keeper".
Do have any eyelets up front that sit low and inboard of the camper wings? These usually had an access door from inside the camper so you could attach turnbuckles from the inside OEM bed anchor points to the camper.