Whenever you have acquired hardware through an external funded source and paid for it through the SAP system, the hardware has one owner: Leiden University. This means that it is not your personal equipment, but is in fact on loan to you by Leiden University. Official university and tax rules forbid us to sell the equipment to any person. This means that when you leave the Observatory you need to return the laptop, USB drive or any other piece of hardware you acquired through official funding.
You are allowed to take the equipment to your new institute in order to extract your science data and copy that information to your new institute's local media. Once that is done you mail order back the equipment to Leiden Observatory.