A photo is worth a thousand what?

I bought this: just one for the bank off site and not sure the d2 Lacies of which bought 3 and are better more long term, would fit in box at the bank, as thicker width.

https://imgur.com/a/HnX8Wux

https://imgur.com/sVmYJpP

The back of my 2015 27" has these ports

https://imgur.com/lDYfPEV

The only cord the idiotic company provided is this:

https://imgur.com/C0A3YFG

Hence I cannot use the hardrive right now. Can I use it later if I buy an adaptor and if so what?

Why would they include this cable , insane right? Whats the point?

What is that cable they provided for?

BTW, I did have in house a cable that had, (just guessing terminology, please correct me: Type a to type a) that did fit into their hardrive and into my old 2015 computer, yet did not work -- why did it not work, it git perfectly both ends

And BTW this is just the bank security deposit hardreive t... The 3 other D1 Lacies just received brand new are still not usable, waiting to monday tuesday, to find out the perfect adapter for that as Lacie (Seagate) did not included adapters as Sandisk and other companies do.. all while on just working harding, no backups.

Was in Apple store today and even they did not have, what 2nd tier Seagate tech said need for those 3 d2, that sit here unused:

The adapter needed:
USB 3.1 Gen 2 type C to USB 3.0

Did not have this in the Apple store today. This is from a new d2 Lacie to an old Apple 2015

But good news, the D2 do come with 7 types of international power coverters or UK, Italy and others countries ( I love love countries, but have no interest in taking this bulky hardrive to.. but no adapters for a non C computer which I imagine 50% of population are still on ( as I'm still on as new 27" imac is still not our in M! or M2)