Additional information that should also be read together with OP:
Package dimension = 59x57x28 (cm)
Package weight = <20Kg (as reported by UPS when shipped to me)
For shipping quotes I suggest you use UPS, FEDEX, TNT and the Swiss Post websites for quotes. As written in the OP you will be responsible for organizing and paying for the pickup and shipment. I will put the units in their original packaging ready for shipment.
Airbill will be denoted as "Used Computer Equipment' and value as requested by buyer.

Extra photo for one of the units: