I am trying to find out how to return my result in the same cell.

I have a VLookup going to another file and returning a value but the lookup can have multiple instances. Right now, it returns only the first occurrence, and need to try to get them all in the same return result. Since it's a number, I mean can I get it to return like "541234,4563465,45234" if there were three instances? What do I need to add into this formula to get that to happen?

=VLOOKUP($A2,'[FI.xls]MASTER INVENTORY SHEET'!$A$1:$E$65536,5,FALSE)