There is one component that is silver, about 1mm x 3mm (guessing), and it's right beside of the ICs. It's one of the larger parts. All the other are WAY too small for my aging eyes. IIRC the number 500 or 50 is stamped on the top. No other marks.
My co-worker noticed that the top of this part on the bad fob was pressed in. It's not on the working fob; it's flat. He thinks he can swap these components.
This is from memory so forgive me if it's off a little.
If its the silver component in the upper left of this image, it says "31500 E 82K" on it. I tried searching some component supplies (such as DigiKey) but I was unsuccessful in finding a replacement.