Kilby writes: This Sunday Kevin & Kell strip‡ was drafted by CIDU Bill in 2019, but never posted. I’m not sure why Holbrook published this strip in February.† I would have thought that late fall or early winter would have been more appropriate, but perhaps the idea was to make the stash revelation completely unexpected.
P.S. (†) – Both the strip one week before and two weeks later are covered in snow; this one and the following Sunday strip look more like springtime.
P.P.S. (‡) – According to the remaining comments on the author’s website, there was originally a misspelling in the first panel, which was later corrected. Nice to see such artistic dedication!
Comics I Don't Understand 
Holbrook may simply have been inspired by one of those “storage wars” shows. A squirrel checks a forgotten storage unit and finds more than they bargained for.
How did they get those in there?
@ dvandom – Thanks for the solution @1, that fits perfectly. This comic appeared just two weeks after the 12th season of Storage Wars ended (after which the show went on a two-year hiatus). I was blissfully ignorant of this little piece of American “culture”; the show has not been exported here. Storage unit facilities do exist in Germany, but they are exceedingly rare (in comparison to the US).
We have something called Storage Hunters UK here, based on a US programme called Storage Hunters; I don’t know how it differs from Storage Wars in format but a cursory glance suggests it is much the same.
As for Squrl getting a big pile of nuts into the storage unit… either he closed the main door and dropped them in through an access hatch in the roof, or else packed them in flimsy boxes which have since perished due to poor climate control inside the unit.
P.S. @ TedD (2) – Squirrels are exceedingly nimble and can squeeze through a surprisingly small gap (in the rafters or elsewhere). They are also mind-numbingly industrious, and have absolutely no trouble repeating the same idiotic task over and over again. The drawing exaggerates this for comic effect, of course, but finding a stash of nuts in an attic or chimney is not uncommon in any neighborhood frequented by squirrels.
A non-infrequent theme in auto repair fora is a car that’s mysteriously underpowered/stalling. The problem turns out to be a stash of nuts or, more often, dogfood (kibble) that an industrious rodent has carefully stashed in the air cleaner or intake plenum. And it’s PACKED in there: looks like something from a factory!
@ Phil (6) – I just completed a round of service and inspection work on our car. The most notable discovery was that the local “marten“† that lives somewhere in our street had recently used our engine as a picnic table to feast on a magpie that he had caught and dragged in. There were no bones left, just some feathers.
P.S. (†) – A marten is similar to a ferret or weasel. The local one in our street has never done any noticeable damage to our car (other than sleeping on the battery cover, leaving traces of fur on the felt). The trouble happens when we are travelling: on at least two occasions when we parked the car close to a marten nest, those animals have attacked the “foreign” scent in our car. One time we had to replace all four radiator hoses (that was expensive), and the second time one bit through the sensor wire for the exhaust system (that was unexpectedly cheap).