To be perfectly honest, yes, especially if there's no physical sign of deterioration or any visible indication of potential leakage.
I'd take the same risk with any AIO cooler out there and not only Corsair. Keep in mind that these units are vacuum sealed in the factory, if there are any flaws during assembly, they are most likely to get caught before packaging. And if for some reason they slipped QC, any sign of a potential problem will likely to be apparent in the first couple of hours of usage. If you've had the cooler running for a week or so in your system with no issues, chances are, the cooler will work as intended for a long time.
I'd take the same risk with any AIO cooler out there and not only Corsair. Keep in mind that these units are vacuum sealed in the factory, if there are any flaws during assembly, they are most likely to get caught before packaging. And if for some reason they slipped QC, any sign of a potential problem will likely to be apparent in the first couple of hours of usage. If you've had the cooler running for a week or so in your system with no issues, chances are, the cooler will work as intended for a long time.