Amazon use a variety of different methods of shipping and you have no real control.
Sometimes it will end up coming all the way by courier and the courier company should contact you. It won't necessarily be the courier company Amazon ship with. Some of the major couriers only have one or two depots in Greece, e.g Athens and Thessaloniki, and they use local couriers for delivery in Greece, e.g. Geniki, ACS, Speedex etc. If your house is easy to find they might deliver right to the door or you might need to meet them somewhere. Often when they phone me I tell them to keep it at their depot and I go and fetch it but that could be a bit dodgy at the moment with lockdown. It's important for there to be a mobile number on the parcel. Couriers etc seem disinclined to use fixed line numbers.
Sometimes Amazon use couriers like DHL-Deutsch Post or UPS i-Parcel who do the final delivery by ELTA so it finishes up at your post office. In that case the post office will contact you either by putting a slip of paper in your post box to tell you the parcel is there or in some cases phoning you.
It is worth noting that in Greece the post code identifies which post office things are delivered to. Vryses is 730 07 while Kalyves is 730 03. Have a look at your electricity bill for example and see what the post code is. You can also look on this web site.
Select Chanion in the box labelled Prefecture and either Kalives or Vrises Apokoronou in the box labelled City and for each one you will get a list of villages which each one covers. You should use the post code appropriate to the post office that your village is listed under. If you are sending stuff or doing any other transaction you can use whatever post office you like. If you expect to get stuff delivered to you it is important to use the post code that is appropriate for your village.
PS Items sent ordinary Royal Mail also arrive by ELTA but sometimes things sent be Royal Mail Track and Trace actually arrive through a local courier company.