Here are some 4K caps of the Ecto Goggles. One thing I noticed while paying heavy attention. The frames are not your typical AN/PVS-5 that you often see. In particular the IR on/off switch is located very close to the edge of the front of the frames.
It becomes very apparent that the Goggles got damaged during filming. In all likelihood, they did not survive the filming. If you think chronologically, the goggles were made and then filmed in NY first. So the only scenes where we see the Ecto Goggles fully intact are at the very end of the movie and during the montage.
If you look during the Sedgewick scenes you can see part of the Ecto Goggles have broken off. The IR emitter knob is gone and around the area of the IR emitter knob there is a big crack. I'm sure the location of the IR emitter knob made it very prone to cracking in that spot, which is why it was moved further in on frames that were produced later. It should be no surprise that the Ecto Goggles were damaged, there are several scenes (the roof top battle for example) where you can see that they got smashed and sat on by Dan Aykroyd or his stunt double.
Here they are at the end of the film, completely intact:
Here is the damage:
Scenes from the Sedgewick:
Great photo of the underside. Notice the IR emitter on/off switch location and the strap on the battery compartment is missing.
Location of IR switch on newer frames:
It is hard to tell, but it is possible that IR switch is also different on the Ecto Goggles.