Super Twit. I assume you mean you purchased an expansion slot cover, the plastic trapdoor.
Just check that none of the silver tracks were lifted, or broken. If you have a continuity meter you can check each end of a track at the nearest component solder blobs, to make sure it is still a circuit. (while it's not plugged in of course)
Also you need to check that no tracks touch each other broken or burred or lifted from the PCB ! A good magnifying glass will help.
Suggest you then put some good electrical tape over the uncovered spots. Maybe that's what the original tape was there for ?
If you are happy that visually the tracks look okay then it should be okay. The green stuff is a resin coating to protect the PCB tracks and offer some insulation/protection.
PS: From the pics it looks like there may be some lifting at the track edges, just make sure these lifted bits are secure and not burred. IE: They can't touch a neighbouring track.
Apart from that the tracks still LOOK intact.
PPS: As to taking off the shielding I know it comes off as I have removed it before. I guess you are trying to get to the battery? If you post some shots of the shield fixings we might be able to offer suggestions.
