After listening to John Mara's (co-owner NYG) interview it didnt sound like he wanted to "shop OBJ". It sounded more like a statment that nobody on that roster should be comfortable after the season they had year ago.
Trade Talk
There is alot of speculation that the Giants are trying to trade WR Odell Beckham Jr, Although they in a "rebuild" this is not the right move. Unless the Giants know OBJ is planning on signing with another team they should do everything in their power to keep him on the roster.
He is the Giants superstar and brought alot of attention to that team. With all that he is also the most valuable trade asset they have. If they do plan on trading him they better ask for alot in return. Eli Manning has at the very best two more years in the leage. They are going to have to after a young QB soon and WR like OBJ is crucial to a young QB's success.
If the Giants go after young QB in the draft like Josh Rosen, or Sam Darnold they are going to want to have weapons to grow with.
All the this trade talk is full of speculation and "what ifs", its fun to talk about but Odell will likely landing a contract with Giants before the season starts.