You seem to have some documentation associated with the part and also the wooden box made to protect the part, which would indicate it has not been installed. Once installed the paperwork would have been filed, the box discarded or reused. The chances of these items being reunited seem slim.There were a few different designs of trunnion pins used to hold cargo and equipment securely in the cargo bay of the orbiter during a mission. As you would imagine, these items were designed to secure some precious cargo through launch loads stresses.
The modules and trusses carried to space by the shuttle to the ISS had such pins each side and also along the keel plate of the orbiter payload bay. The side trunnion pins also have scuff plates to protect the shuttle and cargo during manipulation as the cargo was withdrawn from the orbiter.
Once installed, the pins became redundant and were a potential heat transfer point. Crews undertook EVA activities to install thermal blankets over the trunnion Pins in an effort to reduce thermal energy transfer. One such EVA during STS-88 resulted in the loss of a thermal blanket and became the source of an long winded NASA conspiracy theory. This article has some good information about these pins.
The National Air and Space Museum has a example of the ISS module trunnion pin that is designed to have a scuff plate installed.