Thread link:
http://boards.4chan.org/pol/thread/185666796

first post in thread:
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The truth about the NM Sunspot Observatory Anonymous (ID: b7f/VSsH) 09/14/18(Fri)04:49:39 No.185666796?>>185666951 >>185669204 >>185669281 >>185670118 >>185670350 >>185670431 >>185670949 >>185670972 >>185670994 >>185671458 >>185673737 >>185674368 >>185677380 >>185680966 >>185684128 >>185684614 >>185686488 >>185686739 >>185686860 >>185688335 >>185688359 >>185688769 >>185691849 >>185694224 >>185694419 >>185694552 >>185694700 >>185700237

>NM is a hotspot for child pornography production and distribution
>the server at the observatory had been used to digitally transfer child pornography
>the FBI regularly tracks the distribution of child pornography and detected suspicious activity on the server
>the FBI investigated the facility and discovered a laptop connected to the server that was being used to download/upload child porn for 23+ hours every single day
>the laptop was determined to be the possession of a janitor who worked at the facility

>he was taken into custody
>someone made violent threats to the observatory as a result of the FBI investigation
>the observatory chose to shut itself down temporarily while the FBI investigates the seriousness of the threats
You heard it here first. Screencap this post.
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Subsequent posts in the thread with the ID b7f/VSsH add a few more details.

As to why the post office would have been shut down, that could be to block delivery of a threat package or something like that.