Long outdoors network cable run – Part 2 ... Fiber Optic run working

I can only guess it was an attempt to further weatherproof the ports. A better option would be to use plugs, like these:

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That occurred to me as well but thought at least I'd cut them more flush, maybe helping them look less like something that was stolen!

I used to crimp some RJ-45 males on a few occassions to blank off some female ports (if not crimped the contacts won't let you fully seat them).
 
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I'd cut them more flush, maybe helping them look less like something that was stolen!
That does look a bit odd but yes it's likely for weather protection. I just keep my spares open in the box and really have not had any issues. If the connectors are good gold plated contacts it should easily handle normal outdoor humidity and temps. I like the rubber plugs but in high humidity I could also see it trapping some moisture in the enclosures. My outside box is good enough for weather protection even with thunderstorms that drive rain sideways. I installed 2 vents with foam inserts and one is connected to a thermal fan control. Comes on above 85F. Never any problem.
 
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That does look a bit odd but yes it's likely for weather protection. I just keep my spares open in the box and really have not had any issues. If the connectors are good gold plated contacts it should easily handle normal outdoor humidity and temps. I like the rubber plugs but in high humidity I could also see it trapping some moisture in the enclosures. My outside box is good enough for weather protection even with thunderstorms that drive rain sideways. I installed 2 vents with foam inserts and one is connected to a thermal fan control. Comes on above 85F. Never any problem.
I was looking at those for an outdoor projector housing I am devising for my Christmas decorations.
 
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