Bluetooth and WiFi are "supported" by products but no actual hardware with a interfacing radio is native in the device. I saw this in a BluRay player I was researching. One easy way to check this before buying is to look at the specs to which Bluetooth or WiFi standard the device is actually compatible with. For Bluetooth, https://en.wikipedia.org/wiki/Bluetooth#Specifications_and_features lots of stuff for sale now is advertising version 4.1 or higher. For WiFi, https://en.wikipedia.org/wiki/Wi-Fi#Versions most devices include 802.11n or the newer 802.11ac.
If no mention of the actual version is included in the units capabilities, this likely means the unit has a USB port where you can insert a dongle adding the wireless function you desire.
Should the label that touts Bluetooth support also have print saying, "Dongle required/not included"? Absolutely. Just as many device labels explain that batteries are required and not included.
On the plus side, many retailers today, like the folks at your BestBuy, really go the extra mile for you. Kudos to them and everyone who's knowledgeable and customer centered in brick and mortar retail sales.
I'm glad your sales folks were helpful and thanks for your story. 
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