Good to see whoever programmed it used a good quality foil sticker over the quartz window.
If it survived you should look after it, the chip (eprom) can be damaged by static electricity, keep the blue plastic cover on it at all times, do not touch any of the metal bits inside.
Especially if you get a zap from your car when getting out a lot, make sure you are discharged before putting them in/out of the ecu.