The interview was split in two parts, appearing in the November and December issues of this year (number 11 and 12 of 2014). The December issue is currently for sale in Japan and online shops like amazon.co.jp sell back issues.
The interview covers my collection and topics like how it started, where I have found all these items and what I like most (a similar interview appears in the Before Mario book that has just been released).
I selected a few rare items from my collection (エリックさんの珍品コレクション), which were highlighted alongside the interview. These included my first Game & Watch, the Companion walkie-talkie, Twins seesaw, Popeye Ramen playing cards and an Australian Ultra Hand box.
In the interview, I was asked about the number of items in my collection. I had to omit that I had no idea! I had never kept score of this before and even found it very difficult to make an estimate.
As I had become curious myself, I took a deep breath and started counting...