iPad is locked to owner

Apple cannot (and will not) assist with reuniting a lost device with its owner. Unless a found device has an active network connection - and the owner has marked the device as lost with a visible message in-screen, you’ll not be able to identify the owner or any contact information.

The best advice that can be offered is that you hand the device to your local authorities - along with a description of where and when the device was found. Alternatively, if found at a public transport hub, they will likely have a lost a found department with whom you can deposit the found item.

Be aware that if the iPad is Activation Locked as described, in absence of the original owner, the iPad is and will remain useless to you - or anyone else.

Apple cannot help with identifying the owner - as in using any data to which they may have access will transgress data protection and privacy laws/legislation of many regions and countries - including the European Union.

You also need to understand the Apple Support Community is a user-to-user technical forum. Contributors here are all end-users, just like you. Other than the site Moderators, Apple neither monitor nor participate here. As such, if you hope to reach Apple through these forums, you will be disappointed.

Your best option would be to hand the device to your local authorities - together with an explanation as to where and when the item was found.

You should turn in the iPad to the authorities.