This is
Borszymmen (today called Borzymy).
THX

... finally found it on my "war maps" also. Interesting to find out, that at that time it was the endpoint of a "small-scale"(1000mm) railway from Lyck (Elk today).
Why would it be probable? This comes from a Russian source, so they would know best when they attacked. ...
... given the on many other sources reported problematic communications-situation of the russians at that time as well as later between their middle as well higher commands as well as between units ... I would render it well possible, that they - the ones keeping the records - had rather assumptions than reliable data at hands.
And are you going to me that it would take ten hours about the news of a Russian attack to reach Berlin? How exactly were they going to command the war under these conditions?
Yes, I am "going to you".

None is under full "war conditions" yet, esp. regarding control of communications.
It would - at this point of time - takes as long ... to reach the politicians at least, the only ones of which I have quite exact data (dispatch and receiving of messages were recorded with minutes given).
Completly comparable and in line with the times they received and reacted to the messages of french border violations in the first few days from 1st August onwards.*
At that moment (early evening 1st August 1914) there weren't any soldiers at the mentioned places, they were (most likely) already "concentrating" at their garrisons, otherwise there would have been also fights been reported, which weren't - by neither side.
After the raids there were no communication lines (telephone/telegram) from the mentioned places/villages. The information had to be brought "by hand" to the next "mayor" place (in case of Prostken : Lyck/Elk), means feet, bicycle, horse. Then someone has to be convinced, given "rural" conditions of the people after some publical palaver, to pass the message to official in charge.
All this takes already considerable time until the messages reaches military channnels. More than it took on the western front and the Vogese, where an "intensified" border guarding was already implemented and much easier to be conducted given the "level of development" of that area in general compared to the East-Prussian border regions.
*I DON'T want to discuss, if these messages were true or to which amount they were true or only someone seeing some shadows between trees. The point is there WERE reports of ... something, leading to recorded, documented reactions from Berlin, political Berlin.