HP 15C clear plastic strips

[damaltor]

I did just speed up an HP-15c, one of those with the black film around the electronics and the dedicated logic board which is plugged into the keyboard pcb.
After soldering, i turned the calculator around for a quick test, and these two clear plastic strips fell out.

i am sure that i have had these in the works on my other 15c (the frankenstein-15c which i still have to post about), so i should know how to place them back in the calculator, but that device is not in reach at the moment - so, can someone tell me how to put these back in place? where do they belong? i cannot figure it out for the life of me.
Thanks!
damaltor