No. Wunderground has no knowledge of your Acurite device IDs. They are only used by Acurite to describe a particular sensor that will have its data sent to wunderground. The same is true of your MAC... it is not known by wunderground at all.
The only thing you might be able to search on is your wunderground station ID, but I have no idea how they work for your area.
Just as an example, in the US the first character of your station ID is a "K".
The second and third characters are the two-letter postal abbreviation for your state.
The next group of characters are your city name, shortened to the first 5 characters if necessary.
The remaining characters are digits representing the number of the station in your city in order of its creation.
So, KNEPERU3 would be "K" = United States "NE" = State of Nebraska "PERU" = City of Peru "3" = Third station created for the city of Peru
Or, KTXROUND139 would be "K" = United States "TX" = State of Texas "ROUND" = City of Round Rock "139" = One hundred and thirty-ninth station created of the city of Round Rock
I would expect stations for Namibia would be broken down in a similar manner appropriate for your country.