score:3
If the items are for your personal use, especially if they are unboxed, and you will be departing the country with them, then it is very unlikely that you would attract any attention. The restrictions typically relate to goods and gifts that would be left in the Kingdom.
I am a software developer based in HK and I travel 20+ times a year through BKK. I always have a laptop (often 2), and half a dozen mobiles phones and tablets in my bag, and I have never experienced any problems.
One trick you can try if you want to retain the packaging, is to mail the boxes and receipts back to Ukraine. As well as being the cheapest place in the world for Apple products, Hong Kong has an extremely cheap and efficient postal service. A 1kg package by land to Ukraine would be just HKD $53.