With my experience, the most important thing is to make sure you have the MAC address and Serial number 100% correct!
In your "Server Options" check these boxes:
![duster1_0-1687925186164.png duster1_0-1687925186164.png](/t5/image/serverpage/image-id/3284iBE509D18EE9606B8/image-size/medium?v=v2&px=400)
We received about 80 computers new in the boxes a year or so ago. I imported the basic info including MAC and Serial number into Lansweeper using the spreadsheet that you can download from the import assets option.
Once we started imaging them and Lansweeper saw them on the network it updated everything. No duplicates!