MinerAl said:

I would go by file sizes.  If the installer and Vol.1 both fit on one floppy I'd expect that to be what disk 1 originally looked like.  If Vol.1 is 1.4M all by itself, then it probably was its own disk.

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That's what I was going to say.

Also some installers asked you to insert the disks in a specified order or displayed a status message indicating which disk they thought that they were copying from. You might be able to use that information to figure out where the files are supposed to go.