For anyone who still cares...
I feel like an idiot even bothering to post this, but I'm at work now (one of those police "stations" SumnerH mentioned) with all my resources right in front of me and finished with my responsibilities for the night, so...
From the NYS Penal Law, Larceny (Sec 155.00), definition of "Owner":
In the absence of a specific agreement to the contrary, a person in lawful possession of property shall be deemed to have a right of possession superior to that of a person having only a security interest pursuant to a conditional sale contract or other security agreement.
This definition of ownership applies in regards to a keg procurement. The reason this definition applies is because the initial transfer of ownership in this situation is voluntary from the brewery/distributor, to the person taking possession of the keg. Unless a contract is signed which states that the keg must be returned (independant of any deposit requirements), that person taking possession of the keg is deemed to have superior rights to ownership under NYS Criminal Law at that point.
The section mentioned by SumnerH (Larceny by False Promise), applies to con-artist situations, and situations where an agreement is made to provide a service, payment is made, and the service provider fails to provide the service as agreed upon. As a side note, it is not a
charge, it is part of the definition of larceny. One cannot be charged with Larceny by False Promise, they will be charged with Grand Larceny or Petit Larceny,
by false promise.
Furthermore, regarding that section:
In any prosecution for larceny based upon a false promise, the defendant's intention or belief that the promise would not be performed MAY NOT be established by or inferred from the fact alone that such promise was not performed.
In other words, when someone is charged in this manner, the DA has to be able to prove the person's
intent was to steal the property when entering into the agreement, beyond the mere fact that they didn't return the property/perform the service, which is nearly impossible.
BUT, three people in this office right now, all whose jobs are to classify crime reports, agree that this section does not apply to the type of property transfer we are all discussing.
SO, in the State of NY, 100-MILLION%, whether SumnerH wants to realize it or not, unless you sign a contract that specifically mentions returning the keg is required (not merely to get your deposit back, but absolutely required), it is NOT in anyway a chargeable offense (aka, crime), to keep a legally aquired keg.
PERIOD.