Middleman and whatnot??? Cmon its not like he is selling you something you dont already know. The blue is a 1W 445nm, what is it you are uncertain about. The red and green are pure bonus items considering the price so whether they deliver the exact mW shouldnt matter to much. The red is a no brainer, 200mW is extremely easy to obtain for very little $. The green will probably be below since it is from DX but who cares really, the laser you pay for here is the 445, the rest is pure bonus. So sending it to get measured etc is a big waste of both money and time.
On a sidenote 300$ is a bit much if you ask me considering the pricetag for a new spartan @ 275$. Ofc you get all the extras but still it is a used item. 275$ would make it a great deal, but that is not my call and it is not unreasonable expensive. But if one only wanted the 445 it would be a lot cheaper to buy a DIY solution (barrel, heatsink, driver and diode). You could probably get it for 175-xxx$. For this reason alone it would consider a bit lower price if it was my sale.
Gl with it.
Best regards