[math-fun] Bozonic boson question

"An important characteristic of bosons is that their statistics do not restrict the number that can occupy the same quantum state" https://en.wikipedia.org/wiki/Boson Ok, suppose that I want to _weigh_ one boson. I guess that most bosons are pretty light, so I'll have to weigh a bunch of identical bosons (in "the same" quantum state) & divide by their number. Q: Does this work? Is there any additional energy required to hold them together that would show up as additional mass? Or does an individual boson weigh more singly than when together in "the same" quantum state? How big is the biggest boson, anyway?