I sent the following email to Sunny at Hi-Link (contact info: http://www.hlktech.net/contact.php).
Are the two HLK-PM01s in the attached images genuine Hi-Link parts? A major difference is the part on the right has a bottom cover that is easily removable.
I bought the part on the left from an Aliexpress seller in July 2018. The part on the right was bought from the same Aliexpress seller in May 2019.
Thank you very much for your help.
Here is Sunny's reply:
Now all of our module are use new version .
The one you bought on 2019 is the new version, the old version is not used yet.
By the way,May I know you are the final user or the reseller?
I went to the Aliexpress page in their email and found the HLK-PM01 page. On that page they say:
Recently,there are many fake module in the market,in order to Standardize the market environment,keep benifit for the customers,We,Hi-Link,changed our module to the new but more quality version,the back of new version is show as the following picture,currently,the old version and new version were sent random,please pay attention to that!thank you very much!
They also show images of the previous version (which we are all familiar with) and the new version (with the removable bottom).
So, it appears the HLK-PW01 power supplies with the removable bottom, from a reliable vendor, or directly from Hi-Link, are genuine Hi-Link power supplies.
Below is my two images of the bottom of the two genuine power supplies (old on the left, new on the right).