Update (11.02.2020):
- all the coupons expiring on January 31st, 2020 have already expired
- all the coupons which didn't have an expiration date were disabled, as BTC surpassed 10.000$ (Bitmain set previously this rule for them - to be disabled if BTC surpasses the value of 10.000$)
- at the moment, there are left only a very few amount of coupons, which were issued by Bitmain for those which didn't receive their purchase or to those which received broken equipment. These coupons expire at the end of February / March 2020.
Sorry for meddling with bolding of your text but...
EXCUSE ME...
There are still coupons which have no expiry date and are VALID. Therefore, two statements that I bolded are not true.
There were SOME coupons that didn't have expiry date but had a rule when BTC hits $10k they would expire. But there ARE coupons issued that do not have ANY expiry rule. However, by rule no.7 they still can revoke it if they wish to do it. But that would be a bold move from them. Therefore, it is highly unlikely.
And I will list you all the rules of my coupon bellow:
Coupon usage rules:
1. The coupons will not be issued in cash and cannot be exchanged for cash.
They can only be used to deduct the payment amount when you purchase our miners through Bitmain official website, and the maximum deduction percentage is 30%.
2. More than one coupon cannot be used for the purchase of one item. For the specific usage rules, please check specific product page as reference.
3.During the purchase process, once a coupon has been selected and the order has been submitted, the coupon is deemed to have been used and cannot be used again, even if such an order is not fully paid.
Utilized coupons will NOT be returned once orders are submitted, be the orders valid or not.
4. Once an order is submitted, a coupon cannot be applied on it anymore as orders cannot be amended once they are submitted.
5. Coupons can be transferred to other users’ accounts on Bitmian shop.
6. The amount deducted by the use of a coupon or coupons cannot be invoiced.
7. Bitmain reserves the right to revoke, change the value or limit the usage of all coupons mentioned above without prior notice.
8. The coupon is effective from 00:00:00 on the starting date and no expiry date. 9.The afore-mentioned Purchase coupon can only be used for puchases from our Global Home page.
Proof (current date and time in down right corner):