to promote the pet sounds box set that was due at that time. the box set got delayed yet again but sub pop & cmj went ahead and released their stuff. around this time a "few" copies of the box set were also sent out by capitol and those were traded by collectors long before the box set was officially released.
here is a copy of a story about this from esq issue for june-july 1996. couple of sub pop items and about the box set being delayed.
link:
http://www.sendspace.com/file/tsori4