Door Lock Screws

I found the plate that surrounds the deadbolt and door latch. It was laying between the door and screen. Both screws that hold it on were missing. I noticed the other 4 holding the bulk of the lock were also somewhat loose.

So I failed to do proper maintenance and now am on the hunt for the proper screws. They appear to go into machined threads so my stash of homeowner door screws won't help.

Can anyone tell me where I can get just the replacement screws?