The phrase “for about 75 more” likely refers to:

Elias felt a chill crawl up his spine. The camera on the screen zoomed in on one of the boxes on the shelf. The serial number was burned into the plastic: .

inurl:"ViewerFrame? Mode= intitle:Axis 2400 video server. inurl:/view.shtml. intitle:"Live View / — AXIS" | inurl:view/view.shtml^ AXIS 2400 Video Server

In the Axis 2400’s CGI API, the parameter viewerframe or similar frame-related arguments appear in URL strings to define:

refers to a legacy web-based viewing interface for the AXIS 2400 Video Server