Don't know what sort of schedule you're on so this may not be possible. Get out just before the sky starts to lighten up in the predawn and let the hens out into the run (you do have a fenced run?). This is so the hens will start the call & response "congregational" vocalizations, immediately. The Wilds & Bourbon boys ought to head back toward the hens (unless the two Wilds you saw were only part of a larger cohort intent on making rounds of foraging sites).
Keep plenty of water/scratch/Black Oil Sunflower seeds out in yard/wood line, etc. (place so direct line of sight to hens). I expect the Bourbons will probably wander back in in the A.M. sometime and if someone will be home to keep checking, then they can be herded back into run. Don't let the hens out of coop unless someone will be around (if you have run, turn them out). If the boys stay out "somewhere", hens might well light out for the territories, as well.
If one's flock is imprinted on one's place then keeping even one turkey in the run while the others are ranging around property will, more often than not, serve as a magnet to keep them together (though on opposite sides of fence).
Don't know how much, if any, snow you have on ground. If there is, then I'd put on the head lamp/grab spot and go out and follow tracks (should be plenty near/around base of the trees you saw them roosting in). At least you'll know where they are in the early A.M. and can go out and encourage an early wake up by firing a shot off/yelling loudly, etc. (Wilds likely to fly off/Bourbons likely to fly down for easy herding).
We have winter flocks of up to thirty Easterns that "hang out" in one of the clearings out back, when taking a break from their appointed rounds. Our turkeys are in a fenced run, so there is a lot of "talk" but no wandering.
Summer/Winter Wilds (t-post&fence is limit of our turk run):