If the disks were RAID1, then they read as a normal drive.
The most likely configuration would be RAID-5.
You need to find out if the user knows what the original drive capacity was.
RAID-5 would probably be 1.5TB
RAID-1 for a pair of drives would be 500GB
RAID-0 would be 1TB for the 4 drives.
If you can find the Mac partition header sector (It starts with the string H+) this will give the partition size. A typical logical location for this sector is 0x6402a
For RAID-5, you need to determine the stripe size and the pattern and disk order. This may be a case of trial and error. Some RAID configurations start with RAID-1 then go to RAID-5
Good luck
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