S3 buckets referred within the stack template

The s3 buckets referred in the stack template of the rack refer to the s3 bucket as follows

“InstancesAutoscaler”: {
“Type”: “AWS::Lambda::Function”,
“Condition”: “Autoscale”,
“Properties”: {
“Code”: {
“S3Bucket”: {
“Fn::Sub”: “convox-{AWS::Region}" }, "S3Key": { "Fn::Sub": "release/{Version}/lambda/autoscale.zip”
}
},

where is this s3 bucket located as it is not seen in the current AWS account