"the real location is up the road "
The place has gone or never existed. A CoMaps user reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-06-22T05:04:15Z
POI name: Mallie Post Office
POI types: amenity-post_office
#CoMaps ios

There's a sidewalk here I don't see on the map

via StreetComplete 54.1

Attached photo(s):
https://westnordost.de/p/178894.jpg

GPS Trace: @wcvconsensus/traces/10741664

Unable to answer "What surface does this footpath have here?" for way/396287439 via OpenSidewalks Quests 0.1:

This should be split into two crossings and a concrete footway

onosm.org submitted note from a business:
name: Signiacs
phone: 12062908483
website: http://signiacs.com
twitter:
facebook:
email: [email protected]
hours: monday - friday 9am to 6pm
category: Graphic Design, Printing Services
address: 511 south 1st street selah wa

New houses built

also has separate po box hours

via StreetComplete 58.2

Attached photo(s):
https://westnordost.de/p/231958.jpg

Olympic Hills Emergency Hub:
https://www.olympichillshub.org

there is a trail here, visible on aerial maps also

#OsmAnd

Unable to answer "What’s the name of this place?" – Government Office – way/406519125 via StreetComplete 61.0:

This is not a building, just access to under the freeway

Attached photo(s):
https://streetcomplete.app/p/277954.jpg