Surge of Hamas tunnel news, removal of search equipment raise questions

Just before Israel's Independence Day, we are being deluged with news and statements about the Hamas terror tunnels.
Defense Minister Moshe Yaalon said Tuesday in a radio interview that the reason for the spike in hostilities in the Gaza border area during the last few days is the IDF's operations to locate tunnels in Gazan territory close to the border fence. He said the IDF would not halt its search operations, even those within Gaza.
A short time afterwards, it was announced that a 17-year-old member of Hamas who was involved in the digging of tunnels crossed the border a month ago, surrendered to the IDF and provided a large amount of information on the location of tunnel entrances in Gaza.
In other words, the IDF now has information on where the tunnels are.
Details were also released on the work methods and camouflage used by Hamas when building the tunnels, such as an "important strategic detail" that workers were required to wash themselves before leaving them.
The question that needs to be asked is not regarding the information that Hamas members were suddenly willing to hand over to the IDF, but why there was suddenly complete quiet along the border fence last Thursday, and the mortar and small arms fire from Gaza stopped.
A brief check among residents of Israeli communities in the area found that the area went quiet after the IDF removed its search equipment from Gazan territory and returned it to Israel.
This shows a completely different picture than the one presented by the IDF.
If there is so much information on tunnels and their openings within Gaza, why doesn't the IDF continue to locate and destroy them?