Well I believe this is also a pretty easy thing to validate up to a few thousand eMu (which isn't such a big amount after all).
The investments are done on 3 fronts: 1. BTC, 2. LTC, 3. Wire transfers.
Wire transfers are harder to track, but looking in the blockchain to see total BTC and LTC sent to the addresses Fuserleer uses for these investments can be a pretty good indicator as to how much has been invested from the outside give or take a few % invested by wire transfers.