The only way I see the whole thing without making holes in the back panel is to remove the closet.
At home, I have temporarily moved built-in closets, and I have also demolished built-in closets.
In our case, the closets were nailed together at the front, possibly also at the back, and nailed down into the base, with some also nailed to the ceiling.
By prying the closets apart slightly, it was possible to saw off the nails. There was a gap of 0.5-1 cm upward, which allowed you to lift the closet a bit at the front to either saw off the nails or, with the help of narrow pliers/cutters, "lift" the nails slightly so they could then be pulled out from the inside of the closet.
At home, I have temporarily moved built-in closets, and I have also demolished built-in closets.
In our case, the closets were nailed together at the front, possibly also at the back, and nailed down into the base, with some also nailed to the ceiling.
By prying the closets apart slightly, it was possible to saw off the nails. There was a gap of 0.5-1 cm upward, which allowed you to lift the closet a bit at the front to either saw off the nails or, with the help of narrow pliers/cutters, "lift" the nails slightly so they could then be pulled out from the inside of the closet.
Attach a piece of masking tape with a loop in the middle as a handle. Place the tape at the bottom towards the corner. Now try pulling the backing and see how far you can get it in place. If you can get it in place, you can easily glue it with construction adhesive by repeating with glue and two sturdier handles. If it doesn't quite fit, consider whether it's possible to force it into place, either by making a hole through the backing, fastening a handle with a screw, or taping a handle and then guiding any nails into place. It might be easier to remove the nail than to try to guide them into place. Any holes can be easily filled before painting. If you need to use clamps, that can also be solved, but it's probably easier to just buy a new sheet and install it as backing over the existing one.
It's at the very back and bottom of a closet, so a little caulk and paint will hide most of it.
*brown masking tape on the backing and handle (a piece of cloth works) and glue the tape together with a bit of super glue.
It's at the very back and bottom of a closet, so a little caulk and paint will hide most of it.
*brown masking tape on the backing and handle (a piece of cloth works) and glue the tape together with a bit of super glue.
