Lost my serial number for the disks I have

[Struggling Novice]

I have Visio 2000 installed on an old computer. I have purchased a new
computer and would like to install the program on that new computer before
uninstalling on the old one. I have the CDROMs, but not the cover, and so
have lost the case, and therefore my serial number.

Can I find the serial number somehow by looking at the installed program on
the old computer? If not, is there some other way of recovering the serial
number for installation on the new computer?

Thanks