Hello,
about the search form, one thing you could do is:
1) customize the search form of your table hiding everything except from the serial number (using the permissions tab in admin)
2) create an homepage that just do a redirect to the search form
About the fact that you want to hide some serial numbers, it is not clear to me what you want to achieve, can you explain more in details? I would say this is not related to the original tcarson's post so please open a new thread in the support forum.
Best,