"Shoobie" etymology

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DARE has "benny" from 1977 and "shoobie" from 1968.
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HDAS?
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I did some checking and this 1958 cite seems helpful.
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THE NEW JERSEY SHORE
by John T. Cunningham
New Brunswick: Rutgers University Press
1958
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Pg. 101:
Fast trains to Atlantic City, along with a one-dollar round-trip fare,
created the "day tripper," and the "Dollar Excursion" unquestionably (Pg.
102--ed.) gave the city its wide popularity. Throughout the 1890's and up until  World
War I working men had freedom to play only on Sundays. That day, week in  and
week out, found swaying Atlantic City-bound coaches teeming with
Philadelphia families, laden with their "shoe box lunches."
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Naturally not all of Atlantic City viewed the "Shoe Box Lunch Set" with
favor. Keepers of the swank hotels figured anyone who couldn't come for at least
a week should stay home and get rested for his job.
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(PROQUEST)
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_Season  of Busy Living Opens at Shore Resorts; Season of Traffic and Busy
Living Opens  at Shore Resorts _
(http://proquest.umi.com/pqdweb?index=7&did=256327372&SrchMode=1&sid=2&Fmt=10&VInst=PROD&VType=PQD&RQT=309&VName=HNP&TS=114962
7026&clientId=65882)
By SUZANNE DALEY. New York Times (1857-Current file). New York, N.Y.: May 30,
 1983. p. 1 (2 pages)
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Pg. 22:
Mr. Chomowicz said that the full-time residents called tourists, both
humorously and derisively, "shoobees," referring to their habit of wearing shoes  on
the beach.
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"Every Labor Day," he said, "people hang banners out of their windows which
say, 'Shoobee Go home.'"
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_For  Early Tourists, a Tepid Welcome at Jersey Resort; A Resort Welcomes
Tourists,  Barely _
(http://proquest.umi.com/pqdweb?index=14&did=120612226&SrchMode=1&sid=2&Fmt=10&VInst=PROD&VType=PQD&RQT=309&VName=HNP&TS=1149626982&clientId
=65882)
By NICK RAVO Special to The New York  Times. New York Times (1857-Current
file). New  York, N.Y.: Feb 16, 1987. p. 29 (2 pages)
First page:
"They get offended when we say, 'Shoobie go home.'"
(...)
Shoobie is a name Long Beach Island residents attach to tourists, usually
those from Philadelphia and the New York Metropolitan region. The name is
derived, local residents said, from day-trippers of decades ago who visited the
island and brought their lunch in shoe boxes.
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_Facing  the Tourist Season With Mixed Feelings_
(http://proquest.umi.com/pqdweb?index=44&did=114755224&SrchMode=1&sid=3&Fmt=10&VInst=PROD&VType=PQD&RQT=309
&VName=HNP&TS=1149627495&clientId=65882)
By MARIA  EFTIMIADES. New York Times (1857-Current file).  New York, N.Y.:
May 6, 1990. p. NJ2 (1 page)
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That's when the "shoobes" emerge. "They're the ones who come down and
disturb us," said Ms. Frank, who lives in nearby Margate.
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The term "shoobe," Cape May people say, derives from Philadelphians who  come
to Jersey Shore towns with everything they need--sunglasses, swimsuit,
suntan lotion--fitting into a shoebox.

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