Security workers confronted two males attempting to break into a shipping container at a building site in High Street, Balcombe.
The incident happened at 11.30pm on Sunday, April 4.
A spokesman for Sussex Police said: “The two males ran off from the site into the woods. Did you see or hear anything?
“If you have any information relating to this incident please contact Sussex Police online via firstname.lastname@example.org or call 101quoting serial 1560 of 04/04/2015.