Borehole soil investigation visible?

Hello everyone,

can someone tell me if you can see the boreholes from small driven core and dynamic probing after a geotechnical investigation?

We somehow cannot find any indications on our property as to where exactly was investigated. And that, although the locations are marked on the site plan, even if only symbolically.

With us, nothing could be seen (gravel base - topsoil had already been removed). However, the company took photos during the drilling - the photos were also part of the report.