If you're going to use a Macguffin I say make it something other than a briefcase.
I can accept a good Macguffing story from time to time, but this seemed to dependent on the briefcase. I either needed to know the contents of the briefcase, or I needed to know Brad's motivation. Missing both of those elements made me struggle through the script.
Yeah, the ending was a bit confusing. First, shouldn't Brad want whatever's in the briefcase back? (Unless, as Alex suggested, the whole thing is a setup against Jason and/or Jason's mom, which then begs the question of "Why set up Jason and/or Jason's mom?") Secondly, who's the "we" that will miss Jason? There's no mention of anyone else being associated with Brad to be a "we."
Lots of typos and grammar errors going on. I try not to quibble over one or two, but they're all over the place here.
Great points already brought up. The grammatical errors that Alex pointed out definitely slowed down the reading of this piece. It interrupted the flow of my reading this.
I didn't understand why Jason just accepted the briefcase from Brad, especially when Brad is acting strange.
At the end I'm left with questions, not sure what the build up was for, but without some type of clear motivation and clarity in the end the build up is for nothing. I think with good Macguffin stories it's about the character's pursuing this "thing" more than the object itself. We're not given enough character to know who or what to care about though.