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Hi Chris. Not sure if you are joking or asking the question seriously.  So...if your are really wondering, the answer is yes, there are still open Sears stores. 🤣

There's still a Sears store open?

HI Wynn.  If the Diehard is a vented battery (as opposed to sealed), then yes, the vent tube is necessary. This is especially true of the MKZ (not sure of battery location on the hybrids), due to the partially enclosed/hidden battery position up under the cowl in the back of the engine compartment. The consequences? A possible build up of toxic and explosive battery fumes/gases. Also, the fumes are corrosive and can cause damage to the surrounding area. I would recommend reconnecting it properly, if possible. Keep us updated and good luck.   Edit - Just as an FYI: Where did you obtain the information that your factory battery was only 390 CCA. According to your Owners Manual (page 331), the factory battery for the 2013 MKZh is a Motorcraft BXT-96R-500 or BXT-95R-590 (looks like the 590 may be discontinued). They have 500 and 590 CCA, respectively. Did you purchase your MKZh new or used? If used, the previous owner or the dealer may have replaced the battery with a cheaper/lower CCA one. You could have purchased a properly sized battery, with the 500+ CCA, which would have required no cutting of the battery tray.

UPDATE:  I finally got around to removing the battery tray and trimming it down. Despite little experience using a rotary tool everything was straightforward and I was able to remove the wall section that was preventing my battery from fitting. Really messy and hot plastic granular pieces shooting on my face but its all good.  I installed the new battery I got from Sears the Diehard EP-96R. After I installed it and mounted it I discovered i forgot to plug in the battery vent tube. I felt around the battery and I couldn't find any openings to plug in the vent tube.  Is the vent tube necessary? If I drive with it unplugged would is the consequence of that?   

Ford/Lincoln’s CPO only applies to drivetrain components. There is an additional warranty that you’re described that is a “third party” but it is through the manufacturer. I had this issue when they had to replace a catalytic converter and a seat connector for the left heated seat. The cat was free while the connector cost me $100.  I need to see the extent of it as I’m having a ton of problems with the trunk not wanting to close and the reversing camera not working half the time. Unfortunately my lincoln dealer doesn’t want to ever do anything that’s resembling diag.