possible spawn locations?

You have around a 1 in 10 chance of finding a variant any place an m107 or as50 would have spawned.... So pretty much crash sites. There's also one variant that will spawn at all military spawns, hopefully on a very low probability.

I put a couple of other guns in too but I'd rather let people discover them than ruin the surprise

Next thing I have planned for the loot tables is an increased probability of finding machetes

awesome, i haven't seen a single machete yet

Me neither I know the item was added but I'm not actually sure they added it to the loot in the last patch, no one on our server has ever looted one acording to the database.

I will probably replace the crowbar (which I don't currently have spawning) with it

Regarding the Mk17, I was @ Stary, NEA, and like 4 heli crashes today and still nothing :/

You have to think of it in terms of AS50's, in regular dayz would you have found 10 as50's in 4 crash sites.... It's gonna take more than that

I also made updates to the deathmatch server tonight that should improve the AI and also give humanity loss for kills on them

Machete spawn rate has been increased (not sure they even spawned before)
extra SVD ammo drops have been removed, think regular dayz drops them anyway now

Where are those parcel spwans located?
Or shall I just look around in as many buildings as I can?

military spawns mostly, so look at airfield hangers, traffic control towers, barracks, army tents and firestations