The thefts happened on December 19th and January 8th at the Sam Ash store on Route 38.
According to investigators, on both occasions, the man would enter with a female accomplice.
That accomplice would distract employees while the male suspect put a Les Paul Slim Neck guitar down his pants.
Police say both suspects appear to be in their late 40s to early 50s. Investigators also said the man spoke with a "heavy South Philadelphia accent."
Both left the area in a black SUV driven by a third suspect.
Anyone with information is asked to contact Detective Richard Tomlinson at 856-488-7833.