AGM should not be BOA.
Furthermore, AGM is EXTREMELY easy to get. I got my last two in three days.
To begin with, if your toon does not have an AGM, it is likely that you are not in a twink guild with which you have built a ton of rep that you are afraid of losing. If this is the case (and your main is not in a level 21 guild or better), join a guild that is at least level 21 temporarily. It is EXTREMELY easy to do, even if you don't have a friend in one. Next, make a few friends (also EXTREMELY easy to do unless you are socially impaired.). Explain to these folks in whispers what you are trying to do, and ask them if they can assist when the time comes, that it will take but a minute, and that you can summon them. Then just be online for every spawn possible, invite to group those that are available (convert to a raid group if you have more than 4 interested), and summon all with Have Group Will Travel. Many times I arrived at spawns with 8+ 85's assisting during peak hours. Alot of folks still love to come for the possible pvp action.
Again, this is how I got my last two in three days. It was alot harder before Have Group. But with a little effort these days this process can be virtually painless.
P.S. Don't forget to thank everyone who helps you profusely upon each chest grab. Being abundantly thankful goes a long way.