How to sell paint instruments.

Hi, I’m new to the forum and I hope I’m posting in the right place.

I recently purchased an enclosed trailer for my work as a contractor. The trailer had been used as a mobile auto paint and repair trailer. It came with various painting tools as well as several quarts of Spies-Hecker paint, a Sartorius PMA 7501-X scale, an AcquireRX Spectrophotometer and a paint mixing system.

I’ve been trying to sell these items, but apparently paint suppliers provide all of this equipment as part of the contract.
Can anyone give me advice about how to sell these items? Thank you