That happened to Blake Snyder once - not the blowing up suitcase part - but he wrote a script called "Nuclear Family" and he put the script in a canister with the biohazard/nuclear symbol on it... in his situation though, the script sold to Spielberg for $1 Million Dollars
lol. A whole new definitive twist on the "Hot Spec Script". Hmm... after the police interview, I wonder if the next call that writer received was from an agent working in that building? Perhaps, to inquire if he had anything else; preferably, in the same genre?