Then you need to come in somewhere BEHIND them back into the cover.......not near the fields, They could be leaving the fields early and you'll just hear footsteps going by if you get too close.

Think about what you see as the most likely bedding cover for them........that might also allow them to much a couple white oak acorns coming back from the beans. Get tight to that bedding cover way off the fields on the most likely looking trail..........on the S side of it

Might be tough to find in the dark though.