First...all cases and arrow caddys are to be the same size and color. There is NO reason to have variation! Don't mention this and don't ever let her see two cases at the same time be it for bows OR arrows. Women are smart, they know new bow means new arrows. It's kinda like a dress...new shoes MUST follow!
Always leave an empty case in your truck. Have all deliverys shipped to your work address. Should you aquire a bow simply put it in the case and carry it into the house. This part is important, do not handle the case as if there is something special inside of it. That will arouse suspicion!
NEVER EVER dote over the new bow with anybody but yourself or people you will never talk to again. Your buddies will talk to their wives who in turn will talk to your wife. It will go something like this.."Schmo got a new bow, why can't I get a new bow?" Not good. They are jealous and with malicious intent throwing your butt under the bus! Which BTW, is right next door to the dog house.
You need to be working out of a seperate cash account, use Money Orders and Cashiers checks...no paper trail! All the afore mentioned is wasted effort when she asks...what is this $1,100 dollar charge to a BWA in Nixa, MO. Not good...you are Busted, DOA. There will be $1,000 in designer shoes encroaching into your 1/4 of the closet by next weekend.
Make certain you have multiple "cache" locations. Gear should be stored in convienent locations so you do not need to move gear in and out of the house, or transport it! Should she ever see "inventory" in the truck...dumb, dumb, dumb, let's THINK just a little bit for ourselves here.
One last thing...you need a photo bow, many a bow hunter has covered all the bases only to be busted while showing photos at a dinner party. Somebody, usually a jealous "friend" is going to say, "Hey Schmo, is the new Robertson Hyper Drive XT bow you have been talking about in this picture! What a beauty, that had to set you back what $1,500 bucks? Your wife of GF will be within three feet when this happens...promise.
She'll not say a word but there will be 2K in new shoes in what was once your 1/4 of the closet.