Hi Nick ... Really sorry to hear about this - Was this at your club or elsewhere? - If the former, will pass the word around about thieving bar stewards in the area ...
As to replacing them, you might be tempted to try the new MP18 range which obviously covers the cavity back through to full on blade, but having bought a set of JPX900 Forged this year I can't recommend them highly enough - I think they look fantastic & performance wise they are substantially longer than the MP5's they replaced - Nice compact head in the short irons too (which I prefer) - Blended well with the T7 wedges too which I see you were using ...
Good luck in the search & once again "sorry for your loss"
Paul
PS - If you need irons to use, I have 2x sets of Mizunos here you can borrow (& other clubs including a #7 Odyssey!)