why are people buying so many options, page-27

Bello, i have a 17 yo son for whom I bought a few MPO as his trustee. I got a form from link requesting either his abn or tfn. The reply envelope has the address that you sent your chq to. I wonder if the locked bag address is for ops conversions and the other address for other correspondence. I'd say they will get your chq but I hope there is no hold up because of going to the some department or something silly like that.