owner's manuals MAY contain model number info, but NEVER serial number info, UNLESS someone hand writes it in
Suggestion...
For each appliance, download the PDF version from the Manufacturer
I have a program on my laptop (I have a PDF editor, I think it's called PDF-View but Google was not all that helpful there.
PDF-EDIT a free download from source-forge, claims to do the job, (NOTE: I know nothing about this program)
Use it to "Edit in" the model and serial numbers on the spaces normally provided and save the result to your hard drive, Use AcroRead to verify the edit took
Now you just take your laptop with you to the store. and there is the info