The bait box helped nothing
other Haumittelchen (like baking soda + sugar) does not.
Now I have even sprayed all baseboards and other crack with this spray and was downright shocked HOW MANY suddenly came out as. Wuahhhh. Disgusting. But they were also dead after they came into direct contact with the spray.
Have 3-4 hours thereafter released and the chemical smell of the spray was completely gone.
And now here the whole 3 days and I find the morning still dead silverfish near my baseboards. Which are then absorbed nicely.
In 6 weeks I spray again and watch if there are still some who survived the first attack or whether I'm finally the things going on completely. I will report: -D
UPDATE: 5/16/2014
So, in fact I have found to date regularly dead silverfish. Always close to the bars / chinks. Time really big and then very small Babysilberfischchen. That makes one only aware how many have accumulated without you yourself noted the extent.
Yesterday I then shocked discovered a living silverfish. After pretty much exactly 6 weeks, the first time. It could hardly move and it probably would have died of itself.
I have now re-sprayed everything. Soon, things are eradicated.