Those aren't precancels. There may be a specific name for them that I'm not aware of, but essentially they were large "wavy killer cancels" that were typically used in that day on parcels or larger envelopes to help make certain all postage on the parcel was appropriately cancelled.
Here's one from my collection from the early-1960's from Los Angeles:

The question about "(2) Will" probably is the city name preceded by the station or machine number that applied the cancel. Obviously, "Will" is a rather limited clue to determine where the cancel may have originated, as many possibilities exist, but one I'd suggest is possibly Willamette, Oregon (but I could be wrong).