I said I'd post it one day and now is as good a time as any!
Here's where you can find each snail.
M1-01:
Patrolling around Antares Station
M1-02:
Hiding under the docking platform
M1-03:
Hiding behind the HLD Cardinal
M1-04:
Appears within 500 meters of the beacon about 30 seconds after it's been deployed
M1-05:
Appears when VAC 3 is destroyed
M2-01:
Exits the Adonia's docking bay if the Adonia and at least one other ship from it's convey are kept alive for the first section of the mission
M2-02:
Floating among the debris near a CrossCube piece
M2-03:
Exits the Cardinal's docking bay if the Tarik is destroyed
M2-04:
Hiding in Hasting Depot's docking bay
M2-05:
Flying near the Oslyabya in the mission prelude
M2-06:
Departs the SS St. Lo's docking bay upon it's arrival at the end of the mission
M2-07:
Exits the Lawson's docking bay if the Lawson is disabled
M2-08:
Type SNAIL during the terminal CMD hacking sequence
M2-09:
Randomly guarding one of the cruisers
M2-09L:
Floating high in the debris field about halfway between the node and the station
M3-01:
Hiding on the runway of the Intrepid during the mission intro
M3-02:
Floating high along and ahead of the first freighter's flight trajectory
M3-03:
Hiding near Echelon 1
M3-04:
Will arrive from and guard the Intrepid if they player guides hostile torpedoes into a hostile cruiser
Good hunting!