How to tell if Yosemite is clean install or upgrade from previous version

My brand new MacBook Pro arrived last week, with Yosemite already installed on it.
Having issues with WiFi (after coming out of sleep mode, mbp keeps its self-assigned address rather than getting an address though DHCP or using its old address), I was searching for support on the matter, and one of the solutions often suggested was doing a clean install of Yosemite if the mbp was upgraded from 10.9.
Seeing that the mbp arrived with Yosemite pre-installed, I'm guessing that it is a clean install, but I'm not sure.
I wonder if there is a way in telling if the OS was upgraded to the current major version, or if it's a clean install? Even if Apple only ships clean installs, it would be helpful to know if I need to give support to one of the mac-users in our company if it's a clean install or not.

On my system, the Yosemite upgrade (performed on Oct. 23) left quite a bit of residue that would not be present after a clean install. The most obvious examples are in /var/db/receipts, which contains BOM files for all of the software installed via the Mac OS installer, e.g.,
-rw-r--r-- 1 root wheel     98584 Oct 20 08:49 com.apple.pkg.update.lion.appstore.155-2.bom
-rw-r--r-- 1 root wheel       563 Oct 20 08:49 com.apple.pkg.update.lion.appstore.155-2.plist
-rw-r--r-- 1 root wheel     81657 Sep 29 17:13 com.apple.pkg.update.os.bash.lion.1.0.163-3.bom
-rw-r--r-- 1 root wheel       279 Sep 29 17:13 com.apple.pkg.update.os.bash.lion.1.0.163-3.plist
-rw-r--r-- 1 root wheel     80653 Aug 12 13:34 com.apple.pkg.EPSON_USBPrintClassSL.bom
-rw-r--r-- 1 root wheel       472 Aug 12 13:34 com.apple.pkg.EPSON_USBPrintClassSL.plist

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